EP1091552A2 - Procédé et dispositif de services téléphoniques utilisant de commutateurs TDM et de réseaux de données - Google Patents

Procédé et dispositif de services téléphoniques utilisant de commutateurs TDM et de réseaux de données Download PDF

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Publication number
EP1091552A2
EP1091552A2 EP00308729A EP00308729A EP1091552A2 EP 1091552 A2 EP1091552 A2 EP 1091552A2 EP 00308729 A EP00308729 A EP 00308729A EP 00308729 A EP00308729 A EP 00308729A EP 1091552 A2 EP1091552 A2 EP 1091552A2
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EP
European Patent Office
Prior art keywords
call
network
tdm
switch
data transport
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP00308729A
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German (de)
English (en)
Inventor
Dany D. Sylvain
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Nortel Networks Ltd
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Nortel Networks Ltd
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Filing date
Publication date
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Publication of EP1091552A2 publication Critical patent/EP1091552A2/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/0024—Services and arrangements where telephone services are combined with data services
    • H04M7/0057—Services where the data services network provides a telephone service in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/1245—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks where a network other than PSTN/ISDN interconnects two PSTN/ISDN networks

Definitions

  • the present invention relates to the transfer of voice and voice-grade telephone data over data transport network facilities.
  • the invention relates to a method and apparatus for providing telephone service in which a telephone switching office is directly connected to a data transport network by a plurality of trunk side network adaptors that emulate a time division multiplexed (TDM) trunk network adaptor to the telephone switching office, and emulate a data access node to the data transport network.
  • TDM time division multiplexed
  • PSTN public switched telephone network
  • ATM offers flexible routing solutions that enable more efficient use of resources than the traditional hierarchical structure that has evolved in the PSTN.
  • interfacing between TDM and ATM facilities has proven to be a challenge.
  • Many of the prior art solutions have left issues of ownership and maintenance responsibility blurred because interfaces between the two networks have not entirely belonged to one or the other of the networks, or have required maintenance operations from each network.
  • data transport networks to support voice and voice-grade data services
  • the new generation of telephone central offices preferably preserves the existing infrastructure in subscriber loops and TDM switching equipment, while permitting a scalable, seamless transition to more cost effective and efficient trunking facilities provided by a data transport network, such as an ATM backbone or an IP network with quality of service (QoS).
  • a data transport network such as an ATM backbone or an IP network with quality of service (QoS).
  • TDM time division multiplexed
  • TDM time division multiplexed
  • a network adaptor for a trunk side of a time division multiplexed (TDM) telephone switch comprising a first instance of control software and hardware that interfaces with the TDM switch, a second instance of control software and hardware that interfaces with a data transport network, communicates with the first instance and with corresponding second instances of control software and hardware in corresponding network adaptors of other TDM telephone switches to establish and maintain circuits for the transfer of data related to calls switched by the TDM telephone switch, CHARACTERIZED by:
  • the invention also provides a time division multiplexed (TDM) switch for switching voice-grade pulse code modulated (PCM) data, the TDM switch having a trunk side, comprising a call manager having an interface to a common channel signaling network, the call manager being adapted to formulate, send, receive and interpret common channel signaling messages related to call control, and further adapted to formulate, send, receive and interpret internal call control messages sent to and received from trunk side controllers of the TDM switch, and a switch fabric through which calls are switched for call processing, CHARACTERIZED by:
  • the invention further enables a method of providing telephone service to a plurality of subscribers using a switched telephone network which includes a plurality of time division multiplexed (TDM) switches having a trunk side to which a plurality of trunk side network adaptors that interface with a data transport network are connected, CHARACTERIZED by.
  • TDM time division multiplexed
  • the data transport network with which the trunk side network adaptors in accordance with the invention are interfaced may be any data transport network that provides a quality of service (QoS) suitable for the provision of telephone service.
  • QoS quality of service
  • ATM Asynchronous transfer mode
  • Internet Protocol networks are also an option, as well as Multi-Protocol Label Switched (MPLS) networks, for example.
  • the method and apparatus in accordance with the invention provide many advantages over the prior art.
  • the invention permits a simple, scalable migration from narrowband transport facilities to broadband data transport network facilities. Existing narrowband transport facilities need not be abandoned, but can be gradually adapted to work with data transport networks. Because the invention allows calls from TDM switches with network adaptors to be setup dynamically with any other TDM switches with network adaptors using the data transport network, the need for a second stage of TDM switching (commonly referred as tandem, transit or class 4 switches) is greatly reduced.
  • the preferred features of the invention include a method of providing telephone service to a plurality of subscribers using a switched telephone network which includes a plurality of time division multiplexed (TDM) switches having a subscriber side that supports subscriber equipment and a trunk side to which a plurality of trunk side network adaptors that interface with a data transport network are connected, comprising the steps of:
  • the data transport network may be an asynchronous transfer mode (ATM) network, in which case the step of setting up transport for the call involves the steps of:
  • ATM asynchronous transfer mode
  • the data transport network may also be an Internet Protocol (IP) network, or a Multi-Protocol Label Switched (MPLS) network.
  • IP Internet Protocol
  • MPLS Multi-Protocol Label Switched
  • the invention further provides a method of providing telephone service to a plurality of subscribers using a switched telephone network which includes a plurality of time division multiplexed (TDM) switches having a subscriber side that supports subscriber equipment and a trunk side to which a plurality of trunk side network adaptors that interface with a data transport network are connected, comprising the steps of:
  • TDM time division multiplexed
  • the step of setting up transport for the call involves;
  • the data transport network may also be an Internet Protocol (IP) network or a Multi-Protocol Label Switched (MPLS) network.
  • IP Internet Protocol
  • MPLS Multi-Protocol Label Switched
  • the invention relates to a method and apparatus for providing voice-grade service to subscribers of a switched telephone network.
  • the method and apparatus permit a migration from time division multiplexed switching offices, commonly referred to in the art as "service switching points" (SSPs) to next generations switching offices having trunk side network adaptors which interface directly with data transport networks.
  • SSPs service switching points
  • the method is enabled by a trunk side network adaptor for the TDM switching offices, hereinafter referred to as an Inter-media Gateway (IMG).
  • IMG Inter-media Gateway
  • the IMG emulates a digital trunk controller to the TDM switching office and emulates a data access node or a subtending data source/sink to the data transport network.
  • the next generation switching office enables a flat network in which switching offices may be interconnected without the use or tandem switches. In a flat network, each switch has connections to every other switch in the network.
  • Each pair of switching offices connected to the data transport network share a pool of virtual trunks established between respective pairs of the I
  • FIG. 1 is a schematic diagram of an Inter-media Gateway (IMG) 10 in accordance with the invention.
  • IMG 10 supports a first instance of software and hardware 12 which emulates a TDM digital trunk controller (TDM software/hardware for short) to the TDM switch and is connected to a fabric of the switch by a fabric interface 14, which is well known in the art.
  • the IMG 10 further includes a second instance of software and hardware 16 which interfaces with a data transport network through a data transport link 18.
  • the second instance of software and hardware emulates a data access node in the data transport network (a subtending source/sink node in the network).
  • FIG. 2 is a schematic diagram of a switched telephone network 20 which includes a pair of next generation switching offices 22a, 22b in accordance with the invention.
  • the switching offices 22a, 22b are time division multiplexed (TDM) switches, which are well known in the art.
  • TDM time division multiplexed
  • An example of a next generation TDM switch 22a in accordance with the invention includes a call manager 24a which is responsible for call setup and resource management, as is well understood in the art.
  • the call manager 24a is connected to a switch fabric 26a used for switching calls between a line side and a trunk side of the TDM switch 22a.
  • On the line side of the TDM switch 22a there are a plurality of line interfaces 28a which support subscriber loops 34a that are connected to subscriber equipment 36a, such as telephone sets.
  • the trunk side of the TDM switch 22a is connected to other switches in the switched telephone network 20.
  • the next generation TDM switch 22 may include digital trunk controllers 30, which are connected by TDM trunks 38a to the public switched telephone network (PSTN) 42.
  • PSTN public switched telephone network
  • the TDM switch 22a also includes a plurality of Inter-media Gateways 10a, hereinafter referred to as IMGs 10a.
  • the IMGs 10a are connected to a data transport network 44 by data links 40a, which are also well known in the art.
  • the next generation TDM switch 22b includes the same components as described above. It is also well understood in the art that the functionality described with blocks 10, 24, 26, 28, and 30 can be grouped physically together in different ways and interconnected in various ways while still providing the same overall functionality.
  • the call manager 24a is connected by signaling link 46a to the common channel signaling network, typically a Signaling System 7 (SS7) network 48.
  • the Signaling System 7 network includes signal transfer points (STPs) 50 typically deployed in redundant pairs. It also includes service control points (SCPs) 52 connected to the signaling network by signaling links 54. Signaling links 56 connect the redundant STP pairs 50 to the SS7 network 48.
  • FIG. 3 is a call flow diagram showing a portion of the messages exchanged between next generation TDM switches 22a, 22b in accordance with the invention.
  • a subscriber places a call from telephone 36a serviced by TDM switch 22a to a subscriber at telephone 36b serviced by TDM switch 22b.
  • the call is initiated when the subscriber takes the telephone 36a (FIG. 2) off-hook and dials the directory number of the subscriber telephone 36b.
  • the dialled number is captured by the line interface 20a in a manner well known in the art.
  • the line interface 28a formulates a call control message and forwards the message to the call manager 24a in step 100.
  • the call manager 24a translates the dialled number (step 102) and determines that the call should be terminated at the next generation TDM switch 22b. Routing tables in the TDM switch 22a indicates that the IMG 10a can be used for outbound call setup. Consequently, the call manager 24a formulates an internal call control message which it passes to the IMG 10a in step 104.
  • the internal message is identical to an equivalent message sent to the digital trunk controller 30a of the TDM switch. It indicates a trunk and channel number (circuit identification code (CIC)) to be used for the call. It also indicates that the call is an outbound call.
  • the TDM software/hardware 12 (FIG.
  • the call manager 24a then formulates an Integrated Services Digital Network User Part (ISUP) Initial Address Message (IAM) in accordance with the SS7 protocol.
  • the IAM message further includes the data transport network address of the IMG 10a as described in Applicants' copending Patent Application Serial No. 09/158,855 filed September 23, 1998 and entitled TRANSIT TRUNK SUBNETWORK SYSTEM. Because the message includes information additional to a normal IAM message, it is referred to as a ISUP+ message.
  • the call manager 24a forwards the ISUP+ IAM message in step 106 through the common channel signaling network 48 (FIG. 2) to the call manager 24b of the next generation TDM switch 22b.
  • the call manager 24b On receipt of the message, the call manager 24b translates the called number and determines that the called number is served by the switching office. Consequently, the call manager 24b sends an internal query message to the line interface 28b to determine the status of the subscriber loop 34b. The line interface returns an internal message in step 110 that the line is available. On receipt of the message in step 110, the call manager 24b formulates an internal call control message which is sent to the IMG 10b in step 112. The internal call control message advises the IMG 10b of an inbound call. The message provides the IMG 10b with a trunk and channel number as well as the data transport network address of the IMG 10a.
  • the IMG 10b On receipt of the internal inbound call setup message in step 112, the IMG 10b either selects a virtual connection through the data transport network 44 to the IMG 10a from a cache of pre-established connections, or requests the setup of a new virtual connection in step 114.
  • the data transport network 44 is an asynchronous transfer mode (ATM) network and the IMG 10b issues a switched virtual circuit (SVC) Setup request in step 114.
  • the IMG 10a maps (step 116) the CIC to the VCCI.
  • the IMG 10a returns a channel identifier (VCCI) of the SVC set up to handle the call.
  • ATM asynchronous transfer mode
  • SVC switched virtual circuit
  • the call manager 24b then sends an ISUP Address Complete Message (ACM) (step 126) to the call manager 24a, in accordance with the SS7 protocol.
  • ACM ISUP Address Complete Message
  • the call manager 24b then sends an internal call control message to the line interface 28b requesting that the line interface 28b alert the subscriber telephone set 36b of the incoming call.
  • the line interface applies ringing to the line (not shown) and the subscriber responds by taking the telephone set 36b off-hook (step 130).
  • line interface 28b sends an internal call control message (step 130) to the call manager 24b.
  • the call manager 24b sends an ISUP Answer Message (ANM) (step 132) to call manager 24a. Call setup is thus completed and billing, if appropriate, commences on receipt of the ANM message in step 132.
  • ACM ISUP Address Complete Message
  • next generation TDM offices 22a, 22b call setup between the next generation TDM offices 22a, 22b is accomplished without intervening tandem offices.
  • the data transport network 44 provides virtual direct connections between the TDM switches 22a, 22b. Consequently, a "flat" switched telephone network can be constructed in which each next generation TDM switch is directly connected by virtual trunks to each other next generation switch in the switched telephone network 20.
  • the number of switches in the flat network may be limited by the number of virtual trunks required to support a demand for service in the network and by the scope of the translation tables required in each next generation TDM switch.
  • FIG. 4 is a schematic diagram of another switched telephone network configuration in which a next generation TDM switching office 22a, as described above with reference to FIG. 2, is connected through a data transport network to a prior art TDM switch by a Multi-Services Platform (MSP) 76 which was described in detail in Applicants' copending Patent Application Serial No. 09/206,277 filed December 7, 1998, the specification of which is incorporated herein by reference.
  • MSP Multi-Services Platform
  • the TDM switch 60 includes a call manager 62, a switch fabric 64, a plurality of trunk controllers 66, and a plurality of line interfaces 68 which support subscriber loops 70 connected to subscriber equipment 72.
  • the MSP 76 is connected to the data transport network 44 by a data transport link 78 as described in Applicants' co-pending patent application.
  • the switched telephone network configuration also includes a call manager 80 which is connected to the data transport network 44 by a link 84 and to the common channel signaling network 48 by a signaling link 82.
  • the call manager 80 is enabled to communicate with other nodes in the common channel signaling network 48.
  • the call manager 80 is also enabled to communicate with nodes in the data transport network 44 using the required protocol(s). The functioning of the call manager 80 is described in detail in Applicants' copending patent application referenced above.
  • FIG. 5 is a call diagram showing principal messages exchanged during the setup of the call between a subscriber at telephone set 34a connected to the next generation TDM switch 22a and a subscriber at telephone set 72 connected to the TDM switch 60, using virtual trunks set up through data transport network 44.
  • the user at telephone set 34a commences call setup by taking the telephone set 34a off-hook and dialling a directory number of the subscriber owning telephone set 72 (FIG. 4).
  • the line interface 28a On receipt of the dialled digits, the line interface 28a sends an internal call control message (step 200) to the call manager 24a which translates the dialled digits in step 202.
  • the routing tables used by the call manager 24b indicate that the call should be switched through the IMG 10a which supports a virtual trunk group associated with call manager 80 which implements, with a number of MSPs 76 (only one of which is shown), a distributed tandem switch. Consequently, the call manager 24a formulates an internal call control message that is sent in step 204 to the IMG 10a.
  • the internal call control message indicates to the IMG 10a that an outbound call is to be set up on a trunk and channel (CIC) indicated in the internal call control message.
  • the IMG 10a acts on the internal call control message as described above.
  • the call manager 24a also formulates an ISUP+ IAM, as described above, and forwards the ISUP+ IAM to the call manager 80 (step 206).
  • the routing tables in the next generation TDM switch 22a direct the call manager 24a to address the ISUP+ IAM to a Point Code of the call manager 80 associated with the distributed tandem switch, as described in Applicants' copending patent application referenced above.
  • the call manager 80 On receipt of the ISUP+ IAM, the call manager 80 translates the dialled number in step 208 and determines that the call should be terminated by the TDM switch 60 and that the trunk group associated with the call is terminated on MSP 76. Consequently, the call manager 80 formulates an IAM Advisory message which it forwards in step 210 over signaling link 84 to the data transport network 44. The IAM Advisory message traverses the data transport network 44 and link 78 to the MSP 76 (FIG. 4). In step 212, the MSP 76 responds to the IAM Advisory message with an IAM Acknowledgement message.
  • the call manager 80 formulates and returns a Connection Request message which provides the MSP 76 with the data transport network address of the IMG 10a (step 214).
  • the MSP 76 uses the data transport network address contained in the message to select an SVC from cache, or to set up a new SVC through the data transport network 44 and sends an SVC Setup message (step 216).
  • the SVC Setup message traverse the data transport network 44 to the IMG 10a.
  • the IMG 10a processes the Setup message by mapping the VCCI of the SVC to the CIC identifying the trunk and channel used for the call (step 218).
  • the IMG 10a responds with a Connect message in step 220.
  • the MSP 76 associates the VCCI with the CIC in step 222.
  • a virtual connection is now established between the next generation TDM switch 22a and the MSF 76.
  • the call manager 80 formulates a standard ISUP IAM and forwards the IAM to the call manager 62 of TDM switch 60 in step 224.
  • the TDM switch 60 performs standard call processing functions and establishes an internal connection between the line interface 68 associated with the dialed subscriber and a digital trunk controller 66b (FIG. 4).
  • the call manager 62 of the TDM switch 60 formulates an ISUP Address Complete Message (ACM) and returns the ACM in step 234 to the call manager 80.
  • ACM ISUP Address Complete Message
  • the call manager 80 formulates an ACM Advisory message which it sends through the data transport network 44 (step 236) to the MSP 76 to advise the MSP 76 of the receipt of the ACM.
  • the MSP 76 On receipt of the ACM Advisory message, the MSP 76 returns an ACM Acknowledgement message in step 238.
  • the call manager 80 receives the ACM Acknowledgement message, it forwards an ACM to the call manager 24a in step 240.
  • call manager 62 sends an internal call control message (step 242) to request the line interface 68 to alert the subscriber to the incoming call.
  • the line interface 68 applies ringing to the line (not illustrated) and the subscriber responds by taking telephone 72 off-hook.
  • the line interface 68 reports the off-hook condition using an internal call control message in step 244.
  • the call manager 62 On receipt of the off-hook call control message, the call manager 62 sends an Answer message (ANM) to the call manager 80 in step 246.
  • NAM Answer message
  • Call manager 80 responds by sending an ANM Advisory message in step 248 to the MSP 76.
  • the MSP 76 responds by returning an ANM Acknowledgement message in step 250.
  • the call manager 80 forwards an ANM to the call manager 24a (step 252) and call setup is complete.
  • FIG. 6 is a call flow diagram showing a portion of the messages exchanged between next generation TDM switches 22a, 22b in accordance with the invention during call setup in a forward direction.
  • a subscriber places a call from telephone 36a serviced by TDM switch 22a to a subscriber at telephone 36b serviced by TDM switch 22b.
  • the call is initiated when the subscriber takes the telephone 36a (FIG. 2) off-hook and dials the directory number of the subscriber telephone 36b.
  • the dialled number is captured by the line interface 20a in a manner well known in the art.
  • the line interface 28a formulates a call control message and forwards the message to the call manager 24a in step 300.
  • the call manager 24a translates the dialled number (step 302) and determines that the call should be terminated at the next generation TDM switch 22b. Routing tables in the TDM switch 22a indicates that the IMG 10a can be used for outbound call setup. Consequently, the call manager 24a formulates an internal call control message which it passes to the IMG 10a in step 304. As explained above with reference to FIG. 3, the internal message is identical to an equivalent message sent to the digital trunk controller 30a of the TDM switch. It indicates a trunk and channel number (circuit identification code (CIC)) to be used for the call. It also indicates that the call is an outbound call. On receipt of the internal call control message, the TDM software/hardware 12 (FIG. 1) acknowledges receipt in response to the message per a messaging protocol used by the TDM switch 22a. The internal message is then passed to the data transport software/hardware 16 which records the trunk and channel identifiers and awaits receipt of further instructions.
  • the TDM software/hardware 12 acknowledges receipt in response to the message
  • the call manager 24a then formulates an IAM in accordance with the SS7 protocol.
  • the call manager 24a forwards the ISUP IAM message in step 306 through the common channel signaling network 48 (FIG. 2) to the call manager 24b of the next generation TDM switch 22b.
  • the call manager 24b On receipt of the message, the call manager 24b translates the called number and determines that the called number is served by the switching office. Consequently, the call manager 24b sends an internal query message to the line interface 28b to determine the status of the subscriber loop 34b (step 308).
  • the line interface returns an internal message in step 310 that the line is available.
  • the call manager 24b formulates an internal call control message which is sent to the IMG 10b in step 312.
  • the internal call control message advises the IMG 10b of an inbound call.
  • the IMG 10b awaits the receipt of a resource allocation message to arrive from the data transport network 44.
  • the call manager 24b then sends an ISUP+ Address Complete Message (ACM) (step 124) to the call manager 24a.
  • ACM ISUP+ message contains a data transport network address of the IMG 10b, as described above with reference to the IAM ISUP+ message (FIG. 3). It should be understood that the return of the data transport address of the terminating trunk side network adaptor to the originating switch using an ACM message is only one possible method of passing the address.
  • An ISUP Application Transport Mechanism could also be used, as could a message sent through the data transport network, or any other signaling network.
  • the call manager 24a On receipt of the ISUP+ ACM, the call manager 24a extracts the data network address of the terminating trunk side network adaptor 10b and passes the address in an internal call control message to the IMG 10a (step 316). On receipt of the address in step 316, the IMG 10a either selects a virtual connection through the data transport network 44 to the IMG 10b from a cache of pre-established connections, or requests the setup of a new virtual connection in step 318.
  • the data transport network 44 is an asynchronous transfer mode (ATM) network and the IMG 10a issues a switched virtual circuit (SVC) Setup request in step 318.
  • the IMG 10b maps (step 320) the CIC to the VCCI.
  • the IMG 10b returns a channel identifier (VCCI) of the SVC set up to handle the call in a Connect message (step 322). On receipt of the Connect message, the IMG 10a maps the CIC to the VCCI in step 324.
  • ATM asynchronous transfer mode
  • step 326 the call manager 24b sends an internal call control message to the line interface 28b requesting that the line interface 28b alert the subscriber telephone set 36b of the incoming call.
  • Step 326 can occur a programmable time after the ACM message has been sent or can be triggered by the reception of the setup message in step 318.
  • the line interface applies ringing to the line (not shown) and the subscriber responds by taking the telephone set 36b off-hook.
  • line interface 28b sends an internal call control message (step 328) to the call manager 24b.
  • the call manager 24b sends an ISUP Answer Message (ANM) (step 330) to call manager 24a. Call setup is thus completed and billing, if appropriate, commences on receipt of the ANM message in step 132.
  • ANM ISUP Answer Message

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)
EP00308729A 1999-10-04 2000-10-04 Procédé et dispositif de services téléphoniques utilisant de commutateurs TDM et de réseaux de données Withdrawn EP1091552A2 (fr)

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US411842 1999-10-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249986A3 (fr) * 2001-04-12 2003-11-19 Agilent Technologies, Inc. (a Delaware corporation) Production de registres de détail d' appels
WO2004023837A3 (fr) * 2002-09-09 2004-04-22 Sprint Communications Co Systeme de communication comprenant un systeme de sous-repartition numerique de gestion des paquets
US7443866B2 (en) 2001-09-17 2008-10-28 Siemens Aktiengesellschaft System and method for switching a connection
US8532087B2 (en) 2003-02-03 2013-09-10 Nippon Telegraph And Telephone Corporation Optical network, optical edge router, program thereof, cut through method, and edge router

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101516045B (zh) * 2003-02-03 2011-07-27 日本电信电话株式会社 信息传送网络系统、分组交换机以及分组线路交换机
KR102230409B1 (ko) * 2019-06-05 2021-03-19 백민호 실시간 통번역을 위한 다중데이터 전송장치 및 이를 이용한 전송방법

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249986A3 (fr) * 2001-04-12 2003-11-19 Agilent Technologies, Inc. (a Delaware corporation) Production de registres de détail d' appels
US7076040B2 (en) 2001-04-12 2006-07-11 Agilent Technologies Inc. Generating call detail records
US7443866B2 (en) 2001-09-17 2008-10-28 Siemens Aktiengesellschaft System and method for switching a connection
WO2004023837A3 (fr) * 2002-09-09 2004-04-22 Sprint Communications Co Systeme de communication comprenant un systeme de sous-repartition numerique de gestion des paquets
US8532087B2 (en) 2003-02-03 2013-09-10 Nippon Telegraph And Telephone Corporation Optical network, optical edge router, program thereof, cut through method, and edge router

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